Hot-air furnace



T. WALLACE.

Hot Air Furnace.

No. 54,795. Patented May 15, 1866.

PATENT Orrrce THOMAS WALLACE, OF CHICAGO, ILLINOIS.

HOT-AIR FURNACE.

Specification forming part of Letters Patent No. 54,795, dated May 15,1866; antedated May 1, 1866.

To all whom it may concern:

Be it known that -I, THOMAS WALLACE, of Chicago, in the county of Cookand State of Illinois, have invented a new and useful Improvement inHot-Air Furnaces; and I do hereby declare the following to be a full,clear, and exact description of the same, reference being bad to theaccompanying drawings, and the letters and figures marked thereon, whichform part of this specification.

The nature of my invention will be clearly understood from thedescription hereinafter given.

To enable those skilled in the art to understand how to-construct anduse my invention, I will proceed to describe the same withparticularity, reference being madein so doing to the aforesaiddrawings, in which- Figure 1 represents a longitudinal vertical sectionof my invention, and Fig. 2 a front elevation of the same.

The same letters of reference in the different figures denote the sameparts of my invention.

A represents a horizontal series of pipes, arranged directly over thefire-bed O of the furnace, as shown, and extending back to the rear ofthe furnace, where they are curved or bent back, so as to extend forwardto the front of the furnace, as shown, when, by a similar curve to theone just described, said pipes extend back to therear of thefurnace andpass out. This arrangement of the pipes, each of their horizontalsections lyinga suitable distance above the tier below, enables thehorizontal plates or partitions B to be arranged between said sections,so that the zigzag direction of the pipes corresponds to the zigzag formof the chambers through which they pass, said partitions extendingalternately from the front and rear walls of the furnace nearly to thecurved part of the pipes, as shown.

By reason of the said partitions B the heat and smoke produced by thecombustion of the fuel upon the grate 0 follow the direction of thepipes A, and are kept constantly in contact with them, instead ofpassing directly up past the same to escape through the flue, as wouldbe the case were the partitions removed, and thus obtaining a greatertemperature of the air passing through said pipes with much less fuelthan in ordinary furnaces.

D represent the furnace-doors, through which fuel is introduced 5 and Erepresent small doors, through which the soot and ashes collecting uponthe partitions B may be removed.

J represents a series of pipes attached to the front ends of the pipesA, as shown, extending upward to be attached to the air'chamber I, whichis connected with the fan or blower G by means of the pipe H. WVhen thefire is first kindled in the furnace the fan G is put in operation andforces the air through the pipes A; but after the heating-pipes arethoroughly heated the removable attachment Gr H I J may be removed, asthe upward tendency of the heated air will induce a sufficientquantityof air without the aid of the fan.

F represents plates of glass, isinglass, or any other suitabletransparent material, arranged, as shown, to enable the operator to lookinto the pipes A to see whether or not they are redhot, and it not ofthe proper temperature, to regulate the fire accordingly.

That part of the pipe A which is directly over the fire is the first toburn out, consequently I make it removable by constructing said pipewith ajoint at L.

K K are supports in the furnace, on which the pipe A rests. J is a valvewhich turns 011 the pivot O and enables the operator to regulate thequantity of air which is forced through the pipe A.

The front attachment, Gr HI J, may be made of much lighter material thanthe pipe A, for it is attached to said pipe A at P, and is not subjectedto any severe heat. 7

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, isr The arrangement of the zigzag pipe A andthe horizontal plates or partitions B in a furnace in such a manner thatthe heat from the fire in the furnace shall be made to follow the pipe,substantially as and for the purpose set forth.

THOMAS WALLACE.

Witnesses SAMUEL STRAUS, L. L. OoBURN.

